Liam Fedus
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Works at Periodic Labs
William “Liam” Fedus is a machine learning researcher and entrepreneur associated with Periodic Labs. He previously worked at Google Brain and OpenAI, where he contributed to research on large language models. At OpenAI, he later became vice president of post-training research and was part of the research group that developed ChatGPT. He is known for his work on large language models and post-training research, as well as for his current work referenced through Periodic Labs.
Updated 8 October 2026
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October 2026
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- Periodic Labs employed by this person · 1 source